Privilege escalation in the WebExtensions component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Wed, 14 Oct 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}


Wed, 14 Oct 2026 11:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-269
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Tue, 13 Oct 2026 21:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-269

Tue, 13 Oct 2026 18:30:00 +0000

Type Values Removed Values Added
Description Privilege escalation in the WebExtensions component. This vulnerability was fixed in Firefox 158. Privilege escalation in the WebExtensions component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.
References

Tue, 13 Oct 2026 17:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-269

Tue, 13 Oct 2026 16:45:00 +0000

Type Values Removed Values Added
First Time appeared Mozilla
Mozilla firefox
Vendors & Products Mozilla
Mozilla firefox

Tue, 13 Oct 2026 13:00:00 +0000

Type Values Removed Values Added
Description Privilege escalation in the WebExtensions component. This vulnerability was fixed in Firefox 158.
Title Privilege escalation in the WebExtensions component
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: mozilla

Published:

Updated: 2026-10-14T15:56:49.230Z

Reserved: 2026-10-13T00:29:45.310Z

Link: CVE-2026-109739

cve-icon Vulnrichment

Updated: 2026-10-14T10:37:03.639Z

cve-icon NVD

Status : Deferred

Published: 2026-10-13T13:17:24.480

Modified: 2026-10-14T16:17:37.327

Link: CVE-2026-109739

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-17T08:00:05Z

Weaknesses